<nz-select
  (ngModelChange)="_onChange($event)"
  [(ngModel)]="deftVal"
  [nzAllowClear]="'true'"
  [nzAutoClearSearchValue]="'true'"
  [nzLoading]="isLoading"
  [nzMaxTagCount]="2"
  [nzMaxTagPlaceholder]="tagPlaceHolder"
  nzMode="multiple"
  nzPlaceHolder="请选择">
  <nz-option
               *ngFor="let option of listOfOption" [nzLabel]="option.label" [nzValue]="option.value"></nz-option>
</nz-select>

<ng-template #tagPlaceHolder let-selectedList> 和 {{selectedList.length}} 选中</ng-template>
